Preheat the oven: Set oven to 375°F (190°C). Line a baking sheet with parchment paper or foil.
Prepare the bread: Slice off the top third of the bread loaf. Hollow out the center of the bottom piece, leaving a ½-inch border to create a “boat.”
Mix the filling: In a large bowl, combine shredded chicken, crumbled bacon, cream cheese, ranch dressing, 1 cup cheddar cheese, green onions (if using), black pepper, and smoked paprika (if using). Stir until well blended.
Stuff the bread: Spoon the chicken-bacon mixture into the hollowed-out bread, packing tightly. Sprinkle remaining ½ cup cheddar cheese on top. Add jalapeños, if using.
Season the crust: Brush the outside of the bread with melted butter. Sprinkle garlic powder and Parmesan (if using).
Bake: Place stuffed bread and top piece (if using) on the baking sheet. Bake for 15–20 minutes, until cheese is melted and bread is golden. Cover with foil if browning too quickly.
Serve: Let cool for 5 minutes. Slice into 2-inch pieces, garnish with parsley (if using), and serve warm with extra ranch.